| Indication of surgery | Unknown primary tumour | Known primary tumour |
| Pain | 1 patient (20%) | 2 patient (5.7%) |
| Neurological deficit | 3 patient (60%) | 21 patients (60%) |
| Pain & neurological deficit | 1 patient (20%) | 12 patients (34.2%) |
| Total | 5 patients | 35 patients |